A self-compacting environmentally friendly grouting material and its preparation method

Abstract

The present invention belongs to the technical field of grouting material preparation, and specifically refers to a self-compacting and environmentally friendly grouting material and a preparation method thereof. The self-compacting and environmentally friendly grouting material comprises the following materials in parts by weight: 15-20 parts of cement modifier, 5-8 parts of sand, 4 parts of fly ash, 0.3 part of steel fiber material, 0.5-1.5 parts of polyethylene glycol, 1.5-2 parts of water-reducing and repairing agent, 0.5-0.8 part of cardanol epoxy resin, and 0.2 part of sodium polyacrylate; The present invention uses cement as the base material, co-heats cement and construction waste to form high-strength calcium silicate / calcium sulfoaluminate, calcines natural zeolite and rice husk ash to form a mullite / anorthite composite structure to improve the heat resistance; In addition, PMNS and rice husk ash construct a Si-O bond network to improve fluidity and density, and use sulfonic acid groups to regulate the setting time and fluidity, realizing the high strength, self-compacting and environmental protection characteristics of the material.

Description

Technical Field

[0001] The present invention belongs to the technical field of grouting material preparation, and specifically refers to a self-compacting and environmentally friendly grouting material and a preparation method thereof. Background Art

[0002] With the rapid development of the construction industry, traditional grouting materials are facing severe challenges due to problems such as high cost, high energy consumption, and environmental burden. Existing technologies mostly rely on high-purity cement and aggregates, which not only consume a large amount of resources but also require vibration compaction during construction, making it difficult to meet the filling requirements of complex structures. At the same time, the construction industry generates billions of tons of construction waste every year, and its landfill treatment occupies land and releases harmful substances, while the inefficient resource utilization methods are difficult to realize its potential value. On the other hand, the requirements for the fire resistance, durability, and environmental protection performance of materials in industrial and civil buildings are increasing day by day. Especially in high-temperature environments, ordinary grouting materials are prone to structural failure due to insufficient fire resistance.

[0003] Therefore, developing a new type of grouting material with high strength, self-compaction, excellent fire resistance, environmental friendliness, and low cost has become the key breakthrough point for solving the recycling of construction waste, reducing carbon emissions, and meeting stringent engineering requirements. Summary of the Invention

[0004] In view of the defects of the existing technology, the present invention discloses a self-compacting and environmentally friendly grouting material. Based on cement as the base material, through the co-calcination of construction waste and cement, the SiO2 / Al2O3 in the construction waste reacts with the CaO in the cement to generate high-strength calcium silicate / calcium sulfoaluminate, and natural zeolite and rice husk ash are introduced to form a mullite / calcium feldspar composite structure through high-temperature calcination to improve the overall heat-resistant temperature. The zeolite adsorbs harmful ions and optimizes the ionic environment of the slurry, promoting the enhancement of the interface Si-O-Ca bond to improve the integrity of the material. PMNS (polymethylene naphthalene sulfonate) synergistically reacts with rice husk ash and silane coupling agent to form Si-O-Si bonds to enhance the spreadability. Its naphthalene ring and sulfonic acid group are respectively embedded in the particle gaps during calcination and generate calcium sulfate to delay the setting. The secondary immersion introduces sulfonic acid groups to provide electrostatic repulsion. In the process, the surface tension is reduced through the activation of rice husk ash-interface modification-multiphase calcination. The resource utilization of construction waste not only improves the strength but also reduces CO2 emissions, realizing the preparation of high-performance and low-cost environmental protection materials.

[0005] To achieve the above object, the technical solution adopted by the present invention is a self-compacting and environmentally friendly grouting material, which includes the following materials in parts by weight: 15-20 parts of cement modifier, 5-8 parts of sand, 4 parts of fly ash, 0.3 part of steel fiber, 0.5-1.5 parts of polyethylene glycol, 1.5-2 parts of water-reducing and repairing agent, 0.5-0.8 part of cardanol epoxy resin, and 0.2 part of sodium polyacrylate.

[0006] Furthermore, the preparation method of the cement modifier is as follows:

[0007] I. Weigh 10 - 15 parts of rice husk ash and add it to 50 parts of acid solution, soak for 4 h, wash it alternately with deionized water and absolute ethanol three times each, then calcine it at a temperature of 500 - 700 °C for 2 h, and cool it naturally to room temperature to obtain activated rice husk ash;

[0008] II. Add the activated rice husk ash obtained in step I and 1.5 parts of PMNS to 30 parts of silanol solution, stir at a rotation speed of 800 r / min for 30 min to obtain modified rice husk ash;

[0009] III. Weigh 20 - 35 parts of construction waste, crush it, and sieve it through a 100 - mesh screen to obtain waste powder particles. Weigh 40 - 60 parts of cement, 0.8 part of flux, and 0.3 part of mineralizer, add them to the waste powder particles, and stir at a rotation speed of 800 r / min for 30 min to obtain the base material;

[0010] IV. Put the base material obtained in step III into a temperature condition of 900 - 1200 °C and calcine it for 4 h, with a heating rate of 10 °C / min, cool it naturally to room temperature to obtain the modified material. Weigh 8 parts of natural zeolite and the modified rice husk ash obtained in step II, add them to the obtained modified material, grind it with a drum ball mill for 6 h, with a particle size of 30 - 50 μm, put it into a temperature condition of 650 - 850 °C for secondary calcination for 2 h, with a heating rate of 10 °C / min to obtain the copolymer. Soak the copolymer obtained by secondary calcination in 50 parts of PMNS solution for 24 h, then filter it, wash it 5 times with deionized water, and dry it at a temperature of 65 °C for 24 h to obtain the cement modifier.

[0011] Furthermore, the construction waste is waste bricks and tiles, the acid solution is 10% hydrochloric acid + 90% deionized water, the flux is GaF2, the mineralizer is TiO2, the silanol solution is 30% silanol + 70% deionized water, and the PMNS solution is 15% PMNS + 85% deionized water.

[0012] Furthermore, the preparation method of the water - reducing repair agent is as follows:

[0013] A. Weigh 60 - 90 parts of polyethylene glycol monomethyl ether, heat it at a temperature of 80 °C for 1 h, then add 3 - 6 parts of silane coupling agent and 1.5 - 3 parts of sodium sulfate to it, introduce nitrogen gas with a flow rate of 0.3 L / min, and stir at a rotation speed of 800 r / min for 1 h to obtain the polyethylene glycol monomethyl ether modified product;

[0014] B. Weigh 0.1 - 0.3 parts of triethanolamine and add it to the polyethylene glycol monomethyl ether modifier obtained in step A. Weigh tartaric acid to adjust the pH to 5 - 6, and ultrasonicate for 15 min at an ultrasonic frequency of 60 kHz. Then heat it at 70 - 90 °C for 1.5 h and cool it naturally to room temperature to obtain the precursor of the water-reducing repair agent.

[0015] C. Weigh 25 - 35 parts of silica fume and add it to the precursor of the water-reducing repair agent obtained in step B. Heat it at 70 °C for 2 h and stir it at a rotation speed of 800 r / min. Then add 1 part of ammonium persulfate and 0.3 part of ascorbic acid, cool the temperature to 50 °C and continue heating for 1 h, and cool it naturally to room temperature to obtain the water-reducing repair agent.

[0016] The present invention also provides a preparation method of a self-compacting environmentally friendly grouting material, and the steps are as follows:

[0017] Step 1. Weigh 15 - 20 parts of cement modifier, 5 - 8 parts of sand, 4 parts of fly ash and 0.3 part of steel fiber and add them to 10 parts of silanol-water. Ultrasonicate for 15 min at an ultrasonic frequency of 60 kHz, and then stir it at a rotation speed of 800 r / min for 1 h to obtain the substrate.

[0018] Step 2. Weigh 0.5 - 1.5 parts of polyethylene glycol and 0.5 - 0.8 part of cashew phenol epoxy resin and add them to the substrate obtained in step 1. Stir it at a rotation speed of 800 r / min for 30 min to obtain the complex.

[0019] Step 3. Weigh 1.5 - 2 parts of the water-reducing repair agent and 0.2 part of sodium polyacrylate and add them to the complex obtained in step 2. Stir it at a rotation speed of 800 r / min for 30 min to obtain the self-compacting environmentally friendly grouting material.

[0020] Further, the silanol-water is 30% silanol + 70% deionized water.

[0021] The beneficial effects obtained by the present invention are as follows:

[0022] For the self-compacting environmentally friendly grouting material prepared by the present invention, taking cement as the main material, through the calcination of cement and construction waste, SiO2 / Al2O3 in the construction waste reacts with CaO in the cement to generate calcium silicate or calcium sulfoaluminate. The addition of natural zeolite and rice husk ash enables the complex after high-temperature calcination to form mullite (3Al2O3·2SiO2) or anorthite (CaAl2Si2O8), improving the heat-resistant temperature and enhancing the overall strength of the cement. In addition, the introduction of zeolite adsorbs harmful ions, reducing the risk of shrinkage and erosion. Ca²⁺ replaces Na⁺ / K⁺ in the zeolite, optimizing the ionic environment of the slurry, promoting the synthesis of Si-O-Ca bonds at the interface, and enhancing the integrity of the material.

[0023] The self-compacting and environmentally friendly grouting material prepared by the present invention adds PMNS to promote the formation of Si-O-Si bonds between rice husk ash and silane coupling agent, which can significantly improve the slump flow and dispersion stability of the grouting material. In addition, the naphthalene ring of PMNS is embedded in the gaps between cement particles after calcination, and the sulfonic acid group forms calcium sulfate with calcium oxide after calcination decomposition, inhibiting the hydration of tricalcium aluminate and delaying the setting time. The sulfonic acid group is introduced again by soaking in PMNS solution to change the electric property of the cement surface and provide electrostatic repulsion. The presence of natural zeolite retains the pore structure during the calcination process, adsorbs the gases generated during the calcination process, and reduces the formation of pores during the calcination process. This process reduces the surface tension of the cement material through the process of rice husk ash activation-interface modification-multiphase calcination.

[0024] The self-compacting and environmentally friendly grouting material prepared by the present invention selects construction waste as an auxiliary material to improve the strength of the cement material, and forms chemical bonds and changes the electric property through different calcination conditions, weakening the interfacial tension between materials and promoting the slump flow of the cement material. The present invention prepares a high-performance and high-strength grouting material by optimizing different conditions from material selection to process. The secondary utilization of waste not only reduces carbon dioxide emissions but also reduces production costs. Brief Description of the Drawings

[0025] Figure 1 It is a diagram of the preparation method of the self-compacting and environmentally friendly grouting material proposed by the present invention;

[0026] Figure 2 It is a ζ-potential test diagram of the unmodified cement in Example 2;

[0027] Figure 3 It is a ζ-potential test diagram of the cement modifier in Example 2;

[0028] Figure 4 It is a compressive strength test diagram of the self-compacting and environmentally friendly grouting material prepared in the examples and comparative examples;

[0029] Figure 5 It is a heat resistance temperature test diagram of the self-compacting and environmentally friendly grouting material prepared in the examples and comparative examples;

[0030] Figure 6 It is a shrinkage rate test diagram of the self-compacting and environmentally friendly grouting material prepared in the examples and comparative examples;

[0031] Figure 7 It is a test diagram of the slump flow and flow time of the self-compacting and environmentally friendly grouting material prepared in the examples and comparative examples.

[0032] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. Detailed implementation mode

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0034] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to the described content can be applied to the present invention. The preferred implementation methods and materials described herein are only for demonstration purposes, but cannot limit the content of this application.

[0035] The preparation methods in the following embodiments refer to Figure 1 , unless otherwise specified, are all conventional methods; the materials used in the following embodiments, unless otherwise specified, the parts in the present invention are all parts by weight, the material purity is 99.9%, the molecular weight of the polyethylene glycol used is 3000, and the silane coupling agent is KH-550.

[0036]

[0037] Example 1: A self-compacting and environmentally friendly grouting material, comprising the following materials in parts by weight: 15 parts of cement modifier, 5 parts of sand, 4 parts of fly ash, 0.3 part of steel fiber, 0.5 part of polyethylene glycol, 1.5 parts of water reducing and repairing agent, 0.5 part of cardanol epoxy resin, and 0.2 part of sodium polyacrylate.

[0038] The preparation method of the cement modifier is as follows:

[0039] I. Weigh 10 parts of rice husk ash and soak it in 50 parts of acid solution (10% hydrochloric acid + 90% deionized water) for 4 h, wash it alternately with deionized water and absolute ethanol 3 times each, and then calcine it at 500 °C for 2 h and cool it naturally to room temperature to obtain activated rice husk ash;

[0040] II. Add the activated rice husk ash obtained in step I and 1.5 parts of PMNS to 30 parts of silanol solution (30% silanol + 70% deionized water), and stir it at a speed of 800 r / min for 30 min to obtain modified rice husk ash;

[0041] III. Weigh 20 parts of waste bricks and tiles, crush them, and sieve them through a 100-mesh screen to obtain waste powder particles. Weigh 40 parts of cement, 0.8 part of GaF2, and 0.3 part of TiO2 and add them to the waste powder particles, and stir them at a speed of 800 r / min for 30 min to obtain the substrate;

[0042] IV. The base obtained in step III is calcined at a temperature of 900 °C for 4 h with a heating rate of 10 °C / min, and then naturally cooled to room temperature to obtain a modified product. Weigh 8 parts of natural zeolite and the modified rice husk ash obtained in step II and add them to the obtained modified product. Grind them using a drum ball mill for 6 h with a particle size of 30 - 50 μm, and then calcine them at a temperature of 650 °C for 2 h with a heating rate of 10 °C / min to obtain a copolymer. Soak the copolymer obtained from the secondary calcination in 50 parts of PMNS solution (15% PMNS + 85% deionized water) for 24 h, then filter and wash it 5 times with deionized water, and dry it at a temperature of 65 °C for 24 h to obtain a cement modifier.

[0043] The preparation method of the water-reducing repair agent is as follows:

[0044] A. Weigh 60 parts of polyethylene glycol monomethyl ether, heat it at a temperature of 80 °C for 1 h, then add 3 parts of silane coupling agent and 1.5 parts of sodium sulfate to it, introduce nitrogen gas with a flow rate of 0.3 L / min, and stir it at a rotation speed of 800 r / min for 1 h to obtain a modified polyethylene glycol monomethyl ether.

[0045] B. Weigh 0.1 part of triethanolamine and add it to the modified polyethylene glycol monomethyl ether obtained in step A. Weigh tartaric acid to adjust the pH to 5, and ultrasonicate it at an ultrasonic frequency of 60 kHz for 15 min. Then heat it at a temperature of 70 °C for 1.5 h and naturally cool it to room temperature to obtain a precursor of the water-reducing repair agent.

[0046] C. Weigh 25 parts of silica fume and add it to the precursor of the water-reducing repair agent obtained in step B. Heat it at a temperature of 70 °C for 2 h and stir it at a rotation speed of 800 r / min. Then add 1 part of ammonium persulfate and 0.3 part of ascorbic acid, lower the temperature to 50 °C and continue heating for 1 h, and naturally cool it to room temperature to obtain the water-reducing repair agent.

[0047] This embodiment also provides a preparation method of a self-compacting environmentally friendly grouting material, the steps are as follows:

[0048] Step 1. Weigh 15 parts of the cement modifier, 5 parts of sand, 4 parts of fly ash and 0.3 part of steel fiber and add them to 10 parts of silanol-water (30% silanol + 70% deionized water). Ultrasonicate it at an ultrasonic frequency of 60 kHz for 15 min, and then stir it at a rotation speed of 800 r / min for 1 h to obtain a substrate.

[0049] Step 2. Weigh 0.5 part of polyethylene glycol and 0.5 part of cashew phenol epoxy resin and add them to the substrate obtained in step 1. Stir it at a rotation speed of 800 r / min for 30 min to obtain a composite.

[0050] Step 3. Weigh 1.5 parts of water-reducing repair agent and 0.2 part of sodium polyacrylate, and add them to the composite obtained in Step 2. Stir for 30 min under the condition of a rotation speed of 800 r / min to obtain a self-compacting environmentally friendly grouting material.

[0051] Example 2: A self-compacting environmentally friendly grouting material, comprising the following materials in parts by weight: 18 parts of cement modifier, 7 parts of sand, 4 parts of fly ash, 0.3 part of steel fiber, 1 part of polyethylene glycol, 1.8 parts of water-reducing repair agent, 0.65 part of cardanol epoxy resin, and 0.2 part of sodium polyacrylate.

[0052] The preparation method of the cement modifier is as follows:

[0053] I. Weigh 13 parts of rice husk ash, add it to 50 parts of acid solution (10% hydrochloric acid + 90% deionized water), soak for 4 h, wash alternately with deionized water and absolute ethanol 3 times each, then calcine at 600 °C for 2 h, and cool naturally to room temperature to obtain activated rice husk ash;

[0054] II. Add the activated rice husk ash obtained in Step I and 1.5 parts of PMNS to 30 parts of silanol solution (30% silanol + 70% deionized water), and stir for 30 min under the condition of a rotation speed of 800 r / min to obtain modified rice husk ash;

[0055] III. Weigh 28 parts of waste bricks and tiles, crush them, sieve them through a 100-mesh screen to obtain waste powder particles. Weigh 50 parts of cement, 0.8 part of GaF2, and 0.3 part of TiO2, add them to the waste powder particles, and stir for 30 min under the condition of a rotation speed of 800 r / min to obtain a base material;

[0056] IV. Put the base material obtained in Step III into a temperature condition of 1050 °C and calcine for 4 h, with a heating rate of 10 °C / min, and cool naturally to room temperature to obtain a modified product. Weigh 8 parts of natural zeolite and the modified rice husk ash obtained in Step II, add them to the obtained modified product, grind with a drum ball mill for 6 h, with a particle size of 30 - 50 μm, put it into a temperature condition of 750 °C and calcine for 2 h, with a heating rate of 10 °C / min, to obtain a copolymer. Soak the copolymer obtained by the secondary calcination in 50 parts of PMNS solution (15% PMNS + 85% deionized water) for 24 h, then filter and wash with deionized water 5 times, and put it into a temperature condition of 65 °C and dry for 24 h to obtain a cement modifier.

[0057] The preparation method of the water-reducing repair agent is as follows:

[0058] A. Weigh 75 parts of methoxypolyethylene glycol, heat it at 80 °C for 1 h, then add 4.5 parts of silane coupling agent and 2.4 parts of sodium sulfate thereto, introduce nitrogen gas with a flow rate of 0.3 L / min, and stir for 1 h at a rotation speed of 800 r / min to obtain a methoxypolyethylene glycol modifier;

[0059] B. Weigh 0.2 parts of triethanolamine and add it to the methoxypolyethylene glycol modifier obtained in step A. Weigh tartaric acid to adjust the pH to 5.5, perform ultrasonic treatment at an ultrasonic frequency of 60 kHz for 15 min, then heat at 80 °C for 1.5 h, and naturally cool to room temperature to obtain a water-reducing repair agent precursor;

[0060] C. Weigh 30 parts of silica fume and add it to the water-reducing repair agent precursor obtained in step B. Heat at 70 °C for 2 h and stir at a rotation speed of 800 r / min, then add 1 part of ammonium persulfate and 0.3 part of ascorbic acid, cool the temperature to 50 °C and continue heating for 1 h, and naturally cool to room temperature to obtain a water-reducing repair agent.

[0061] This example also provides a preparation method of a self-compacting environmentally friendly grouting material, and the steps are as follows:

[0062] Step 1. Weigh 18 parts of cement modifier, 7 parts of sand, 4 parts of fly ash and 0.3 part of steel fiber and add them to 10 parts of silanol-water (30% silanol + 70% deionized water), perform ultrasonic treatment at an ultrasonic frequency of 60 kHz for 15 min, and then stir at a rotation speed of 800 r / min for 1 h to obtain a substrate;

[0063] Step 2. Weigh 1 part of polyethylene glycol and 0.65 part of cardanol epoxy resin and add them to the substrate obtained in step 1, stir at a rotation speed of 800 r / min for 30 min to obtain a composite;

[0064] Step 3. Weigh 1.8 parts of water-reducing repair agent and 0.2 part of sodium polyacrylate and add them to the composite obtained in step 2, stir at a rotation speed of 800 r / min for 30 min to obtain a self-compacting environmentally friendly grouting material.

[0065] Example 3: A self-compacting environmentally friendly grouting material, comprising the following materials in parts by weight: 20 parts of cement modifier, 8 parts of sand, 4 parts of fly ash, 0.3 part of steel fiber, 1.5 parts of polyethylene glycol, 2 parts of water-reducing repair agent, 0.8 part of cardanol epoxy resin, 0.2 part of sodium polyacrylate and 0.15 part of silanol.

[0066] The preparation method of the cement modifier is as follows:

[0067] I. Weigh 15 portions of rice husk ash and add them to 50 portions of acid solution (10% hydrochloric acid + 90% deionized water), soak for 4 h, wash alternately with deionized water and absolute ethanol three times each, then calcine at 700 °C for 2 h, and cool naturally to room temperature to obtain activated rice husk ash;

[0068] II. Add the activated rice husk ash obtained in step I and 1.5 portions of PMNS to 30 portions of silanol solution (30% silanol + 70% deionized water), stir at a rotation speed of 800 r / min for 30 min to obtain modified rice husk ash;

[0069] III. Weigh 35 portions of waste bricks and tiles, crush them, and sieve them through a 100-mesh screen to obtain waste powder particles. Weigh 60 portions of cement, 0.8 portion of GaF2, and 0.3 portion of TiO2, add them to the waste powder particles, and stir at a rotation speed of 800 r / min for 30 min to obtain the substrate;

[0070] IV. Put the substrate obtained in step III into a temperature condition of 1200 °C and calcine for 4 h, with a heating rate of 10 °C / min, cool naturally to room temperature to obtain the modified product. Weigh 8 portions of natural zeolite and the modified rice husk ash obtained in step II, add them to the obtained modified product, grind with a drum ball mill for 6 h, with a particle size of 30 - 50 μm, put them into a temperature condition of 850 °C for secondary calcination for 2 h, with a heating rate of 10 °C / min to obtain the copolymer. Soak the copolymer obtained by secondary calcination in 50 portions of PMNS solution (15% PMNS + 85% deionized water) for 24 h, then filter and wash with deionized water five times, and dry at 65 °C for 24 h to obtain the cement modifier.

[0071] The preparation method of the water-reducing repair agent is as follows:

[0072] A. Weigh 90 portions of polyethylene glycol monomethyl ether, heat it at 80 °C for 1 h, then add 6 portions of silane coupling agent and 3 portions of sodium sulfate to it, introduce nitrogen gas with a flow rate of 0.3 L / min, and stir at a rotation speed of 800 r / min for 1 h to obtain the polyethylene glycol monomethyl ether modified product;

[0073] B. Weigh 0.3 portion of triethanolamine and add it to the polyethylene glycol monomethyl ether modified product obtained in step A. Weigh tartaric acid to adjust the pH to 6, ultrasonicate at an ultrasonic frequency of 60 kHz for 15 min, then heat at 90 °C for 1.5 h, and cool naturally to room temperature to obtain the precursor of the water-reducing repair agent;

[0074] C. Weigh 35 parts of silica fume and add it to the water-reducing repair agent precursor obtained in step B. Heat it at 70 °C for 2 h and stir it at a speed of 800 r / min. Then add 1 part of ammonium persulfate and 0.3 part of ascorbic acid. Cool the temperature to 50 °C and continue heating for 1 h. Naturally cool it to room temperature to obtain the water-reducing repair agent.

[0075] This example also provides a preparation method of self-compacting environmentally friendly grouting material, and the steps are as follows:

[0076] Step 1. Weigh 20 parts of cement modifier, 8 parts of sand, 4 parts of fly ash and 0.3 part of steel fiber and add them to 10 parts of silanol-water (30% silanol + 70% deionized water). Use ultrasonic with a frequency of 60 kHz for 15 min, and then stir it at a speed of 800 r / min for 1 h to obtain the substrate.

[0077] Step 2. Weigh 1.5 parts of polyethylene glycol and 0.8 part of cashew phenol epoxy resin and add them to the substrate obtained in step 1. Stir it at a speed of 800 r / min for 30 min to obtain the complex.

[0078] Step 3. Weigh 2 parts of water-reducing repair agent and 0.2 part of sodium polyacrylate and add them to the complex obtained in step 2. Stir it at a speed of 800 r / min for 30 min to obtain the self-compacting environmentally friendly grouting material.

[0079] Comparative example:

[0080] The difference between comparative example 1 and example 2 is that the cement modifier is changed to cement, and the process of removing the cement modifier is removed. The rest is the same as example 2.

[0081] The difference between comparative example 2 and example 2 is that the water-reducing repair agent is not added. The rest is the same as example 2.

[0082] The difference between comparative example 3 and example 2 is that the cement modifier is changed to cement, the process of removing the cement modifier is removed, and the water-reducing repair agent is not added. The rest is the same as example 2.

[0083] In order to test the performance of the self-compacting environmentally friendly grouting material prepared in the examples and comparative examples, the following tests were carried out.

[0084] Figure 2 It is the ζ potential test chart of the unmodified cement in example 2. The test refers to GB / T 27768-2011. After two tests, the surface potential of the unmodified cement is stable at -10.45 mV. Figure 3It is the ζ potential test chart of the cement modifier in Example 2. From the test results, it can be seen that the potential on the surface of the cement after modification has changed significantly. The potential on the surface of the modified cement is stabilized at -33.54 mV, indicating that the modified cement exhibits greater electrostatic repulsion. Figure 4 It is the compressive strength test chart. The test conditions are to prepare a cube with dimensions of 100 mm × 100 mm × 100 mm, and the test standard refers to GB / T 17671-1999 for compressive testing. From the test results, it can be seen that the self-compacting environmentally friendly grouting material prepared in the example exhibits better compressive strength. When cured for 14 days, the compressive strength of Example 2 reaches 41 MPa. When the curing days reach 28 days, the compressive strength is as high as 63 MPa, and the overall compressive strength is higher than that of other examples and comparative examples. Figure 5 It is the temperature test chart. It can be seen that the heat-resistant temperature of Example 2 reaches 940 °C, which is much higher than the heat-resistant temperatures of other examples and comparative examples, indicating that mullite (3Al2O3·2SiO2) or anorthite (CaAl2Si2O8) can be formed in the composite after high-temperature calcination and is successfully introduced. Figure 6 It is the test chart of the slump flow and flow time of the examples and comparative examples. The test refers to the standard JGJ / T283-2012 (T50 ≤ 5 s). The test method: Use a slump cone with an upper diameter of 100 mm, a lower diameter of 200 mm, and a height of 300 mm and a horizontal rigid bottom plate. Fill the self-compacting environmentally friendly grouting material prepared in the examples and comparative examples into the slump cone at one time. After scraping flat, lift it vertically, and start the stopwatch to record the maximum slump flow and flow time of the slurry. Among them, the slump flow of Example 2 reaches 715 mm, and the time used is 3.77 s, which is much higher than the slump flow and flow time of other examples and comparative examples, indicating that the self-compacting environmentally friendly grouting material prepared in Example 2 has better fluidity. In addition, the shrinkage rate of the slurry after testing the slump flow was tested, and the test standard refers to GB / T50448-2015. The results are as Figure 7 shown. After 28 days of curing, the shrinkage rate of Example 2 is as low as 0.0078%, indicating that the self-compacting environmentally friendly grouting material prepared in Example 2 has better performance and is far superior to the performance of other groups. Obviously, the above comparative examples and examples are only a part of the comparative examples and examples of the present invention, and the comparative examples and examples based on such references are all within the scope protected by the present invention.

[0085] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0086] The above describes the present invention and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual application is not limited thereto. In summary, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, design in a non-creative way similar ways and embodiments to this technical solution, they shall fall within the protection scope of the present invention.

Claims

1. A self-compacting environmentally friendly grouting material, characterized in that, It includes the following materials by weight parts: 15 - 20 parts of cement modifier, 5 - 8 parts of sand, 4 parts of fly ash, 0.3 part of steel fiber, 0.5 - 1.5 parts of polyethylene glycol, 1.5 - 2 parts of water reducing and repairing agent, 0.5 - 0.8 part of cardanol epoxy resin, and 0.2 part of sodium polyacrylate; The preparation raw materials of the water reducing and repairing agent include the following materials by weight part ratio: polyethylene glycol monomethyl ether: silane coupling agent: silica fume: triethanolamine: sodium sulfate: tartaric acid = 60 - 90: 3 - 6: 25 - 35: 0.1 - 0.3: 1.5 - 3: 2; The preparation raw materials of the cement modifier include the following materials by weight part ratio: cement, construction waste, natural zeolite, and rice husk ash = 40 - 60: 25 - 35: 8: 10 - 15; The preparation method of the cement modifier is as follows: I. Weigh the rice husk ash, add it to the acid solution, wash it, and calcine it to obtain activated rice husk ash; II. Add the activated rice husk ash and polymethylene naphthalene sulfonate sodium to the silanol solution, and stir to obtain modified rice husk ash; III. Weigh the construction waste and crush it to obtain waste powder particles. Weigh the cement, flux, and mineralizer, add them to the waste powder particles, and stir to obtain a substrate; IV. Calcine the substrate, cool it to obtain a modifier. Weigh the natural zeolite and modified rice husk ash, add them to the modifier, grind it, and calcine it twice to obtain a copolymer. Soak the copolymer in the polymethylene naphthalene sulfonate sodium solution, and dry it to obtain the cement modifier.

2. The self-compacting and environmentally friendly grouting material according to claim 1, wherein The construction waste is waste bricks and tiles, the acid solution is 10% hydrochloric acid + 90% deionized water, the flux is GaF2, the mineralizer is TiO2, the silanol solution is 30% silanol + 70% deionized water, and the polymethylene naphthalene sulfonate sodium solution is 15% polymethylene naphthalene sulfonate sodium + 85% deionized water.

3. An self-compacting and environmentally friendly grouting material according to claim 1, characterized in that, The preparation method of the water reducing and repairing agent is as follows: A. Weigh the polyethylene glycol monomethyl ether, heat it, add the silane coupling agent and sodium sulfate, ventilate and stir to obtain a polyethylene glycol monomethyl ether modified product; B. Weigh the triethanolamine and tartaric acid, add them to the polyethylene glycol monomethyl ether modified product, ultrasonically treat and heat it to obtain a water reducing and repairing agent precursor; C. Weigh the silica fume, add it to the water reducing and repairing agent precursor, heat and stir it, add ammonium persulfate, and cool it to obtain the water reducing and repairing agent.

4. A preparation method of a self-compacting and environmentally friendly grouting material according to any one of claims 1-3, characterized in that, The steps are as follows: Step 1. Weigh the cement modifier, sand, fly ash, and steel fiber, add them to the silanol - water, ultrasonically treat and stir to obtain a substrate; Step 2. Weigh the polyethylene glycol and cardanol epoxy resin, add them to the substrate, and stir to obtain a composite; Step 3. Weigh the water reducing and repairing agent and sodium polyacrylate, add them to the composite, and stir to obtain a self - compacting and environmentally friendly grouting material.

5. The preparation method of a self-compacting and environmentally friendly grouting material according to claim 4, characterized in that, The silanol - water is 30% silanol + 70% deionized water.

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